Empty ParallelAnimation/SequentialAnimation emit stopped() signal twice and earlier than started() signal

Rectangle {
    id: root
    width: 600
    height: 400
    color: "seagreen"

    ParallelAnimation {
//    SequentialAnimation {
        id: animation
        running: true

//        ColorAnimation {
//            target: root
//            property: "color"
//            to: "salmon"
//            duration: 2000
//        }

        onStarted: console.log("animation started")
        onStopped: console.log("animation stopped")
    }
}

qml: animation stopped
qml: animation stopped
qml: animation started

qml: animation started
qml: animation stopped